| 1 | /******************************************************************************* |
| 2 | * Copyright (c) 2014, 2015 Ecole Polytechnique de Montreal |
| 3 | * |
| 4 | * All rights reserved. This program and the accompanying materials are |
| 5 | * made available under the terms of the Eclipse Public License v1.0 which |
| 6 | * accompanies this distribution, and is available at |
| 7 | * http://www.eclipse.org/legal/epl-v10.html |
| 8 | * |
| 9 | * Contributors: |
| 10 | * Florian Wininger - Initial API and implementation |
| 11 | * Naser Ezzati - Add the comparison operators |
| 12 | * Patrick Tasse - Add message to exceptions |
| 13 | ******************************************************************************/ |
| 14 | |
| 15 | package org.eclipse.tracecompass.tmf.analysis.xml.core.model; |
| 16 | |
| 17 | import java.util.ArrayList; |
| 18 | import java.util.List; |
| 19 | |
| 20 | import org.eclipse.jdt.annotation.Nullable; |
| 21 | import org.eclipse.tracecompass.statesystem.core.ITmfStateSystem; |
| 22 | import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException; |
| 23 | import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue; |
| 24 | import org.eclipse.tracecompass.tmf.analysis.xml.core.module.IXmlStateSystemContainer; |
| 25 | import org.eclipse.tracecompass.tmf.analysis.xml.core.module.XmlUtils; |
| 26 | import org.eclipse.tracecompass.tmf.analysis.xml.core.stateprovider.TmfXmlStrings; |
| 27 | import org.eclipse.tracecompass.tmf.core.event.ITmfEvent; |
| 28 | import org.w3c.dom.Element; |
| 29 | |
| 30 | /** |
| 31 | * This Class implement a condition tree in the XML-defined state system. |
| 32 | * |
| 33 | * <pre> |
| 34 | * example: |
| 35 | * <and> |
| 36 | * <condition> |
| 37 | * <stateAttribute type="location" value="CurrentThread" /> |
| 38 | * <stateAttribute type="constant" value="System_call" /> |
| 39 | * <stateValue type="null" /> |
| 40 | * </condition> |
| 41 | * <condition> |
| 42 | * </condition> |
| 43 | * </and> |
| 44 | * </pre> |
| 45 | * |
| 46 | * @author Florian Wininger |
| 47 | */ |
| 48 | public class TmfXmlCondition { |
| 49 | |
| 50 | private final List<TmfXmlCondition> fConditions = new ArrayList<>(); |
| 51 | private final @Nullable ITmfXmlStateValue fStateValue; |
| 52 | private final LogicalOperator fOperator; |
| 53 | private final IXmlStateSystemContainer fContainer; |
| 54 | private final ConditionOperator fConditionOperator; |
| 55 | |
| 56 | private enum LogicalOperator { |
| 57 | NONE, |
| 58 | NOT, |
| 59 | AND, |
| 60 | OR, |
| 61 | } |
| 62 | |
| 63 | private enum ConditionOperator { |
| 64 | NONE, |
| 65 | EQ, |
| 66 | NE, |
| 67 | GE, |
| 68 | GT, |
| 69 | LE, |
| 70 | LT |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Constructor |
| 75 | * |
| 76 | * @param modelFactory |
| 77 | * The factory used to create XML model elements |
| 78 | * @param node |
| 79 | * The XML root of this condition |
| 80 | * @param container |
| 81 | * The state system container this condition belongs to |
| 82 | */ |
| 83 | public TmfXmlCondition(ITmfXmlModelFactory modelFactory, Element node, IXmlStateSystemContainer container) { |
| 84 | fContainer = container; |
| 85 | |
| 86 | Element rootNode = node; |
| 87 | /* Process the conditions: in each case, only process Element nodes */ |
| 88 | List<@Nullable Element> childElements = XmlUtils.getChildElements(rootNode); |
| 89 | |
| 90 | /* |
| 91 | * If the node is an if, take the child as the root condition |
| 92 | * |
| 93 | * FIXME: Maybe the caller should do this instead. |
| 94 | */ |
| 95 | if (node.getNodeName().equals(TmfXmlStrings.IF)) { |
| 96 | if (childElements.isEmpty()) { |
| 97 | throw new IllegalArgumentException("TmfXmlCondition constructor: IF node has no child element"); //$NON-NLS-1$ |
| 98 | } |
| 99 | rootNode = childElements.get(0); |
| 100 | childElements = XmlUtils.getChildElements(rootNode); |
| 101 | } |
| 102 | |
| 103 | if (rootNode == null) { |
| 104 | throw new IllegalArgumentException(); |
| 105 | } |
| 106 | |
| 107 | switch (rootNode.getNodeName()) { |
| 108 | case TmfXmlStrings.CONDITION: |
| 109 | fOperator = LogicalOperator.NONE; |
| 110 | /* Read comparison type */ |
| 111 | String equationType = rootNode.getAttribute(TmfXmlStrings.OPERATOR); |
| 112 | |
| 113 | switch (equationType) { |
| 114 | case TmfXmlStrings.EQ: |
| 115 | fConditionOperator = ConditionOperator.EQ; |
| 116 | break; |
| 117 | case TmfXmlStrings.NE: |
| 118 | fConditionOperator = ConditionOperator.NE; |
| 119 | break; |
| 120 | case TmfXmlStrings.GE: |
| 121 | fConditionOperator = ConditionOperator.GE; |
| 122 | break; |
| 123 | case TmfXmlStrings.GT: |
| 124 | fConditionOperator = ConditionOperator.GT; |
| 125 | break; |
| 126 | case TmfXmlStrings.LE: |
| 127 | fConditionOperator = ConditionOperator.LE; |
| 128 | break; |
| 129 | case TmfXmlStrings.LT: |
| 130 | fConditionOperator = ConditionOperator.LT; |
| 131 | break; |
| 132 | case TmfXmlStrings.NULL: |
| 133 | fConditionOperator = ConditionOperator.EQ; |
| 134 | break; |
| 135 | default: |
| 136 | throw new IllegalArgumentException("TmfXmlCondition: invalid comparison operator."); //$NON-NLS-1$ |
| 137 | } |
| 138 | /* The last element is a state value node */ |
| 139 | Element stateValueElement = childElements.remove(childElements.size() - 1); |
| 140 | if (stateValueElement == null) { |
| 141 | throw new IllegalStateException(); |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * A state value is either preceded by an eventField or a number of |
| 146 | * state attributes |
| 147 | */ |
| 148 | @Nullable Element firstChild = childElements.get(0); |
| 149 | if (firstChild == null) { |
| 150 | throw new IllegalStateException(); |
| 151 | } |
| 152 | |
| 153 | if (childElements.size() == 1 && firstChild.getNodeName().equals(TmfXmlStrings.ELEMENT_FIELD)) { |
| 154 | String attribute = firstChild.getAttribute(TmfXmlStrings.NAME); |
| 155 | fStateValue = modelFactory.createStateValue(stateValueElement, fContainer, attribute); |
| 156 | } else { |
| 157 | List<ITmfXmlStateAttribute> attributes = new ArrayList<>(); |
| 158 | for (Element element : childElements) { |
| 159 | if (element == null || !element.getNodeName().equals(TmfXmlStrings.STATE_ATTRIBUTE)) { |
| 160 | throw new IllegalArgumentException("TmfXmlCondition: a condition either has a eventField element or a number of TmfXmlStateAttribute elements before the state value"); //$NON-NLS-1$ |
| 161 | } |
| 162 | ITmfXmlStateAttribute attribute = modelFactory.createStateAttribute(element, fContainer); |
| 163 | attributes.add(attribute); |
| 164 | } |
| 165 | fStateValue = modelFactory.createStateValue(stateValueElement, fContainer, attributes); |
| 166 | } |
| 167 | break; |
| 168 | case TmfXmlStrings.NOT: |
| 169 | fOperator = LogicalOperator.NOT; |
| 170 | fStateValue = null; |
| 171 | fConditionOperator = ConditionOperator.NONE; |
| 172 | Element element = childElements.get(0); |
| 173 | if (element == null) { |
| 174 | throw new IllegalArgumentException(); |
| 175 | } |
| 176 | fConditions.add(modelFactory.createCondition(element, fContainer)); |
| 177 | break; |
| 178 | case TmfXmlStrings.AND: |
| 179 | fOperator = LogicalOperator.AND; |
| 180 | fStateValue = null; |
| 181 | fConditionOperator = ConditionOperator.NONE; |
| 182 | for (Element condition : childElements) { |
| 183 | if (condition == null) { |
| 184 | continue; |
| 185 | } |
| 186 | fConditions.add(modelFactory.createCondition(condition, fContainer)); |
| 187 | } |
| 188 | break; |
| 189 | case TmfXmlStrings.OR: |
| 190 | fOperator = LogicalOperator.OR; |
| 191 | fStateValue = null; |
| 192 | fConditionOperator = ConditionOperator.NONE; |
| 193 | for (Element condition : childElements) { |
| 194 | if (condition == null) { |
| 195 | continue; |
| 196 | } |
| 197 | fConditions.add(modelFactory.createCondition(condition, fContainer)); |
| 198 | } |
| 199 | break; |
| 200 | default: |
| 201 | throw new IllegalArgumentException("TmfXmlCondition constructor: XML node is of the wrong type"); //$NON-NLS-1$ |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * Test the result of the condition for an event |
| 207 | * |
| 208 | * @param event |
| 209 | * The event on which to test the condition |
| 210 | * @return Whether the condition is true or not |
| 211 | * @throws AttributeNotFoundException |
| 212 | * The state attribute was not found |
| 213 | */ |
| 214 | public boolean testForEvent(ITmfEvent event) throws AttributeNotFoundException { |
| 215 | ITmfStateSystem ss = fContainer.getStateSystem(); |
| 216 | /* |
| 217 | * The condition is either the equality check of a state value or a |
| 218 | * boolean operation on other conditions |
| 219 | */ |
| 220 | if (fStateValue != null) { |
| 221 | ITmfXmlStateValue filter = fStateValue; |
| 222 | int quark = IXmlStateSystemContainer.ROOT_QUARK; |
| 223 | for (ITmfXmlStateAttribute attribute : filter.getAttributes()) { |
| 224 | quark = attribute.getAttributeQuark(event, quark); |
| 225 | /* |
| 226 | * When verifying a condition, the state attribute must exist, |
| 227 | * if it does not, the query is not valid, we stop the condition |
| 228 | * check |
| 229 | */ |
| 230 | if (quark == IXmlStateSystemContainer.ERROR_QUARK) { |
| 231 | throw new AttributeNotFoundException(ss.getSSID() + " Attribute:" + attribute); //$NON-NLS-1$ |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | /* Get the value to compare to from the XML file */ |
| 236 | ITmfStateValue valueXML; |
| 237 | valueXML = filter.getValue(event); |
| 238 | |
| 239 | /* |
| 240 | * The actual value: it can be either queried in the state system or |
| 241 | * found in the event |
| 242 | */ |
| 243 | ITmfStateValue valueState = (quark != IXmlStateSystemContainer.ROOT_QUARK) ? ss.queryOngoingState(quark) : |
| 244 | filter.getEventFieldValue(event); |
| 245 | if (valueState == null) { |
| 246 | throw new IllegalStateException(); |
| 247 | } |
| 248 | |
| 249 | return compare(valueState, valueXML, fConditionOperator); |
| 250 | |
| 251 | } else if (!fConditions.isEmpty()) { |
| 252 | /* Verify a condition tree */ |
| 253 | switch (fOperator) { |
| 254 | case AND: |
| 255 | for (TmfXmlCondition childCondition : fConditions) { |
| 256 | if (!childCondition.testForEvent(event)) { |
| 257 | return false; |
| 258 | } |
| 259 | } |
| 260 | return true; |
| 261 | case NONE: |
| 262 | break; |
| 263 | case NOT: |
| 264 | return !fConditions.get(0).testForEvent(event); |
| 265 | case OR: |
| 266 | for (TmfXmlCondition childCondition : fConditions) { |
| 267 | if (childCondition.testForEvent(event)) { |
| 268 | return true; |
| 269 | } |
| 270 | } |
| 271 | return false; |
| 272 | default: |
| 273 | break; |
| 274 | |
| 275 | } |
| 276 | } else { |
| 277 | throw new IllegalStateException("TmfXmlCondition: the condition should be either a state value or be the result of a condition tree"); //$NON-NLS-1$ |
| 278 | } |
| 279 | return true; |
| 280 | } |
| 281 | |
| 282 | @Override |
| 283 | public String toString() { |
| 284 | return "TmfXmlCondition: " + fOperator + " on " + fConditions; //$NON-NLS-1$ //$NON-NLS-2$ |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * Compare two ITmfStateValues based on the given comparison operator |
| 289 | * |
| 290 | * @param source |
| 291 | * the state value to compare to |
| 292 | * @param dest |
| 293 | * the state value to be compared with |
| 294 | * @param comparisonOperator |
| 295 | * the operator to compare the inputs |
| 296 | * @return the boolean result of the comparison |
| 297 | */ |
| 298 | public boolean compare(ITmfStateValue source, ITmfStateValue dest, ConditionOperator comparisonOperator) { |
| 299 | switch (comparisonOperator) { |
| 300 | case EQ: |
| 301 | return (source.compareTo(dest) == 0); |
| 302 | case NE: |
| 303 | return (source.compareTo(dest) != 0); |
| 304 | case GE: |
| 305 | return (source.compareTo(dest) >= 0); |
| 306 | case GT: |
| 307 | return (source.compareTo(dest) > 0); |
| 308 | case LE: |
| 309 | return (source.compareTo(dest) <= 0); |
| 310 | case LT: |
| 311 | return (source.compareTo(dest) < 0); |
| 312 | case NONE: |
| 313 | default: |
| 314 | throw new IllegalArgumentException("TmfXmlCondition: invalid comparison operator."); //$NON-NLS-1$ |
| 315 | } |
| 316 | |
| 317 | } |
| 318 | |
| 319 | } |